新品快讯

麦克泰公司最近重点宣传了瑞典IAR公司新一代单片机开发工具和著名的μC/OS-II嵌入式操作系统相关图形和网络模块。 IAR Embedded Workbench(EW)的C/EC++交叉编译器和调试器是一套完整的和容易使用的专业嵌入式应用开发工具。包括:嵌入式C/C++优化编译器,汇编器,连接定位器,库管理员,编辑器,项目管理器和C-SPY调试器。IAR System是嵌入式领域少数能够提供这种解决方案的公司之一。EW今天已经支持35种以上的8位/16位/32位的微处理器结构。 IAR visualSTATE是一套基于状态机的UML兼容的图形化     

基于单片机的快速代码生成方法

基于模型设计是国外流行的一种先进的嵌入式系统开发方式,该方式主要利用开发工具Simulink以及Matlab的RTW（Real-TimeWorkshop）工具箱的代码生成功能,采用IAR作为中间工具,将RTW生成的C语言代码转为为在单片机MSP430F2252中可以运行的HEX文件,最后通过Protues软件来验证代码的正确性。该方法无需设计者精通各种编程语言,只需了解设计规范与实现原理,极大地降低了嵌入式系统开发难度,缩短了开发周期,并且能够保证代码的高效性、可靠性。     

基于MSP430单片机的开关稳压电源设计

介绍基于MSP430单片机的开关稳压电源的系统结构和总设计方案。该设计硬件电路由整流滤波电路、升压斩波电路、PWM驱动电路及保护电路组成。该系统的软件是在IAR Embedded Workbench开发环境下采用C语言编写,主要包括12位高精度A/D采集、PWM驱动电路、过流保护等模块的设计,同时具有键盘设定、液晶显示实时等功能。     

基于Delphi的单片机实训仿真系统的设计

为提高学生学习单片机课程的兴趣,积极参与课程设计的环节中,从降低单片机开发难度的角度考虑,本文设计出一种基于Delphi的单片机实训仿真系统.该仿真软件主要由登录界面、欢迎界面以及工作界面构成,且通过该仿真软件可以直接打开单片机仿真软件PROTEUS以及程序编写软件KEIL.学生可以在学习该仿真系统中关于常用的电路模块以及子程序的介绍的基础上,然后根据实际设计要求在该仿真系统中进行相关系统的开发.本文中所介绍的单片机实训仿真系统,采用的是开源代码设计,以后使用过程中,可以添加相关的电路模块以及子程序.     

基于Robei的SPI接口设计

首先这里介绍一款新的EDA设计软件Robei。Robei支持以Verilog为基础的数字电路及FPGA设计,它将图形化的设计界面和代码设计界面结合在一起,融合了图形界面的直观性和代码设计的灵活性。与此同时,在设计生成的Verilog文件中,Robei软件可以自动为用户生成包括模块定义、输入输出定义、数据类型定义部分的代码,无需用户手动输入。之后使用Robei软件进行SPI(Serial Peripheral Interface,串行外设接口)的设计,通过实例说明使用Robei软件进行设计的优势和长处。最后同样使用Robei软件对设计进行仿真和功能验证,展示Robei在FPGA前端设计流程中全面而丰富的功能。     

机载雷达发射机控制保护电路的实现

机载雷达发射机控制保护电路主要完成发射机技术参数监测、工作次序控制、与雷达进行信息交换的任务。介绍了该电路的设计与实现过程,描述了基于单片机、CPLD（复杂可编程逻辑器件）、多路数控增益放大器的硬件设计,给出了数据采集、故障判断、控制、存储4个主要软件模块的流程图。在软硬件设计过程中,采用了模块化设计,电路结构紧凑,代码量小,便于维护和扩展。该电路对提高发射机的可靠性有重要意义。     

STM32F10X系列微控制器标准外设库的应用

基于简化Cortex-M核微控制器嵌入式软件的开发步骤,增强软件可移植性的目的,对微控制器软件接口标准(CMSIS)、ST公司标准外设库V3.5的文件结构、相互联系、功能作用进行了简要介绍,并以具有Cortex-M3内核的STM32F103VET6为例,给出了IAR FOR ARM6.30编程环境下的开发步骤。结合具体应用,本文对数据端口、中断进行设置,缩短了开发时间,提高了代码效率。     

基于80C196KC&PSD4235G2在线编程的实现

可编程外围器件PSD应用于MCU系统后,单片机可以执行一个存储器的代码,同时擦除和编程另一个存储器,因而可以通过上位机远程更新用户软件,实现在线编程(In Application Programming).同时,简化了MCU外围电路的设计,增加了系统的可靠性和稳定性.     

基于80C196KC ＆ PSD4235G2在线编程的实现

可编程外围器件PSD应用于MCU系统后，单片机可以执行一个存储器的代码，同时擦除和编程另一个存储器，因而可以通过上位机远程更新用户软件，实现在线编程(In Application Programming)。同时，简化了MCU外围电路的设计，增加了系统的可靠性和稳定性。     

基于多串口扩展技术的定点剖面观测系统设计

为了满足定点剖面测量系统多个串口通信的需要,设计了一种基于ATmegal28L的多串口扩展电路。详细介绍了该电路的硬件设计和部分软件代码。该电路将TI公司的异步串口芯片TLl6C754用于ATmegal128L的串口扩展,可以扩展4路串口。扩展的串口分别与海流计、CTD、浮力调节系统、水声通信系统连接,进行串口通信,传送控制指令和测试数据。实际应用证明,该电路设计可靠,稳定性好,解决了ATmegal128L在串行通信系统中的串口数量的局限性。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.